Please apply the steps mentioned in the below link
Also you can find all archived verion of flash player using this link http://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html
Unfortunately, that didn't do the trick. I ran the script (as Administrator), rebooted, reinstalled Flash Player. Crash. So then I re-ran the script (as Administrator), rebooted again. Crash!
I have Firefox running FlashPlayer 10.3 and that works. As I mentioned, the ActiveX installer for FlashPlayer 10.3 finds a newer version available and won't install. The only option is to quit. I must say, this frustrates me.
Any more thoughts out there?